Update JDK to 21 in android.yml

Author: kirich1409

.github/workflows/android.yml

@@ -13,10 +13,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: set up JDK 11
+    - name: set up JDK
       uses: actions/setup-java@v4
       with:
-        java-version: '11'
+        java-version: '21'
         distribution: 'temurin'
         cache: gradle